Sa'd ibn Ubadah

Sa'd ibn Ubadah (died 636) was a sahabi of Muhammad.

Biography
Sa'd ibn Ubadah was the emir of the Banu Khazraj tribe of Arabia, and he hailed from Medina. He was one of the men who swore the Second Pledge of al-Aqabah, becoming the first man from Medina to convert to Islam. Sa'd ibn Ubadah was captured by the Quraysh and tortured, but Mut'im ibn 'Adi and Harith ibn Harb rescued him. Sa'd ibn Ubadah and Sa'd ibn Muadh were sent to ensure that the Jewish Banu Qurayzah had not broken their treaty with the Muslims, and he also fought at the Battle of Badr. After Muhammad's death, he disagreed with the reigns of Abu Bakr and Umar, and he was shot dead with an arrow in Syria by a delegation from Umar when he refused to pledge allegiance to him.